Pet door



FIG. 1 is a front, right side, top perspective view of a pet doorshowing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an enlarged detailed view of the region as indicated by thereference number 8 as shown in FIG. 1 .

The broken lines depict the boundaries of the enlargements and form nopart of the claimed design.

CLAIM The ornamental design for a pet door, as shown and described.